Everyone must have seen in a number of movies, the good guy or the bad guy shaking the glass around with an exotic drink inside it. This glass can just make that swirling look more aesthetic and realistic.Â TheÂ Roller Rock GlassÂ costs just a $22. It has its own ice ball mold and a spike in the middle to guide the ice ball around the edge of the glass, slowly cooling your drink without watering it down.